- Patients with non-adenocarcinomas, adenosquamous carcinomas, islet cell (neuroendocrine) tumors, cystadenomas, cystadenocarcinomas, carcinoid tumors, duodenal carcinomas, distal bile duct, and ampullary carcinomas; patients with tumors that are largely IPMN with a minimal or minor component of invasive carcinoma are not eligible; patients with acinar carcinomas are not eligible; patients with IPMN's that contain some secondary (minor) foci of adenocarcinoma are also not eligible